Mentality, is the concept that we hold about ourselves and believe that concept to be the Truth. Whereas Truth, in its absolute sense could be different. And absolute Truth is NOT what our mentality leads us to believe and behave. Unless we have a compelling urge to know 'what could be this really is?', we always delude ourselves to remain in complete ignorance.
Let me throw some light (sun light!!) on what I said above. We all know that sun-light lights up the world and we are able to see what is around us. Is that light instantaneous? Means, is that sun-light which makes me to see around, left the sun just at that very moment and reached my location instantaneously. No No. It left the sun about 8.3 minutes before and I am receive it at this instant. WHat is the consequence of this simple observation? It shows that the sun is not at its location when I am observing. It would have travelled approx about 17 KMs further.
This simple observation gives a profound knowledge of Mentality. We always hold everything that is experienced to be the truth, because we never give it a critical examination before concluding for its worth to be true. Why do we do that? Because we are bound by habits not to have a compelling urge to critically examine. And why we do not critically examine? Because we find comfort in aligning with the consensus of people around, or follow what some people of repute have propagated or simply why to take a risk and to prove what?
Is it necessary to critically examine everything in life? Is it worth an attempt? NOT AT ALL, if you are happy in whatever you are experiencing as life, if you are as peaceful now as you were a child who remained in ignorance, if you are proud to be a human but insentient.
Why should I critically examine everything then? Because you are the only creature endowed with the faculty known as INTELLECT. No other life form on this planet has this. If you do not put this into use, you end up living the life of a winged white ant, that is born, lives for a day and then dissolve.
Whom do I have to prove that intellect of mine, by undertaking such critical examination of everything? TO NOBODY. Only To Yourself , to make this life of yours with a purpose and to have the worth of living.
Is it going to be so tedious to exercise the intellect in everything? Not at all, it's a breeze. You might wonder when you know that it requires absolutely nothing except a curiosity and some time to regurgitate your experiences.
And when you do this, you move to the realm of INNER MINING, otherwise more generally known as Spirituality as well as various other names. This does not require any material tools, any twisting and turning of the body, any special location in the mountains or Ashrams, Caves or Temples or places of worship, for that matter not even your bodily postures.
That's how breezy it is!!!